Twyer.



A. B. SMITH.

TWYER.

APPLICATION FILED FEB. 4, 1914.

1,1 01, 1 52, Patented June 23, 1914.

ALvI'A B. SMITH, or MIDDLEBURY, VERMONT.

' TWYER.

Specification of Letters Patent.

Patented June 23, 1914.

Application filed February 4, 1914. Serial N 0. 816,542.

To all whom it may concern Be it known that I, ALVIA B. SMITH, a citizenof the United States, residing at Middlebury, in the county of Addisonand State of Vermont,have invented certain new and useful Improvementsin Twyers, of which the following is a specification, reference beinghad to the accompanying drawings.

This invention relates to twyers and more particularly to a .forgetwyer, the invention having for its primary object to provide a simple,inexpensive and reliable device of this character for supplying air tothe fire bed of a blacksmiths forge.

The invention has for another important object to provide a twyer havingcertain improved structural features, whereby liability of clogging ofthe air passages is obviated, and to facilitate the dumping or dischargeof the ashes or cinders.

The invention has for another of its objects to provide means forsupplying air to .the air receiving chamber of the twyer either from ahand blower or electric fan through a single air conducting passage.

The invention has for a further object to generally improve and simplifythe construction of devices of the above character and render the samestrong, durable and serviceable in practical use.

With the above and other objects in view as will become apparent as thedescription proceeds, the invention consists in certain constructions,combinations and arrangements of the parts that I shall hereinafterfully describe and claim.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawings, in which Figure 1 is aside elevation of a twyer emioodying my invention in its preferred form.Fig. 2 is a top plan view. Fig. 3 is a section taken on the line 3-3 ofFig. 2. Fig. 4 is a section taken on the line 44 of Fig. 1.

Referring in detail to the drawings, 5 designates the fire pot of ablast forge such as is commonly used by blacksmiths, said fire pot beingformed from a single metal plate, the central portion of which is ofconical shape in cross section as indicated at 6. At the outer edge ofthis conical body portion of the fire pot the same is provided with anoutwardly inclined downwardly extending flange 7, and upon the edge ofthis flange the laterally projecting attaching flange is formed, saidlatter flange being preferably of square or rectangular shape in plan.The lower body portion of the twyer 9 is also of conical form in crosssection and is provided upon its edge with an upstanding flange 10 fromwhich the rectangular flange 11 laterally extends, the flange 8 of thefire pot be- 1ng adapted for engagement upon the flange 11 and securedthereto as clearly shown in Fig. 3 of the drawings.

It will be observed that when the parts are assembled the fire pot 6 andthe lower body portion 9 of the twyer are inverted, the flanges 8 and 11being secured together whereby the conical portions of the fire pot andbody are maintained in spaced relation to provide the air chamberindicated at 12. In the apex of the conical portion 6 of the fire pot acircular opening 13 is formed and contiguous to this opening a pluralityof rectangular openings 14 are provided in the fire pot. The apex of thebody portion 9 of the twyer is also provided with a relatively large ashor cinder outlet opening 15. This opening is normally closed by aconical valve plate 16 which is secured upon one end of a lever 17. Thislever is fulcrumed intermediate of its ends upon a depending bracket 18which is fixed to the twyer body 9. One end of a coil spring 19 issecured to said bracket, the other end of said spring being attached tothe lever 18. This spring normally operates to hold the valve plate 16in the opening 15 and close the same. Air is supplied to the chamber 12through the passage or conduit 20 which opens into said chamber throughone side of the body 9 at its upper end. To this conduit, a second pipeor conduit 20 is connected and extends at right angles thereto. A valveplate 21 is pivotally mounted at 22 within the pipe or conduit 20 uponthe side of the opening therein surrounded by the valve pipe 21 which isfar thest removed from the twyer. Assuming that the several parts of mydevice have been arranged together in the manner above explained andmounted in the forge, the operation of the device will be understood asfollows. When it is necessary to supply air to the fire bed, the handblower, electric fan or other blast producing means is set in operation.Assuming that the pipe or conduit 20 is connected to the hand blower,the air enters therefrom into the chamber 12 of the twyer and circulatesaround the fire pot 5 so that it is heated, said air rising through theopenings 13 and 14 in the bottom of the fire pot as additional air issupplied to the chamber 12. If it is desired to supply airto the twyerfrom the electric fan or other source, the same will enter from the pipe20 into the passage 20, the valve plate 21 being moved from the positionshown in full lines in Fig. 3 of the drawings to the position indicatedin dotted lines so that the air as it enters the pipe 20 cannot movebackwardly therein but enters the receiving chamber 12 of the twyer asshown by the arrows.

From the above description, taken in connection with the accompanyingdrawings, the construction, manner of operation and several advantagesof my invention will be clearly and fully understood. The ashes orcinders collecting in the chamber 12 may be easily and quickly removedtherefrom by simply operating the lever 17 to remove the valve plate 16from the opening 15. The inclined body walls of the twyer will directsuch accumulations downwardly through said opening. By supplying the airblasts between the spaced fire pot and body wall, liability of the airsupplying passages becoming choked or clogged with cinders isefiectually prevented and the in coming cold air by contact with thewalls of the fire pot is heated before it is finally forced upwardly bythe increasing air pressure through the openings 13 and 14 and into thefire bed. seen that I have produced a device whereby the fire pot may beeasily and quickly heated to a high degree. It is also to be observedthat the apex of the fire pot intersects the plane of the discharge endof the blast pipe, whereby it will be perceived that the air blast isdirected against such apex of the fire pot, whereby the wall thereof iscooled and the possibility of the burning out of the fire pot is reducedto a minimum. It

In this manner it will be will also be observed that a portion of thestructed in various forms and sizes as may be required by the size ofthe forge in connection with which the invention is to be used. It isalso to be further understood that the invention is susceptible ofvarious other modifications in form,proportion and arrangement of theseveral parts and I therefore reserve the privilege of resorting to suchlegitimate changes as may be fairly embodied within the spirit and scopeof the appended claim.

What is claimed is: V

The hereindescribed twyer including a body of inverted conical form, afire pot also of inverted conical form arranged above said body andsecured thereon, the inclined walls of the body and the fire pot beingdisposed in spaced parallel relation, said body at its apex having anash outlet opening, a valve normally closing said opening, and

an air blast ipe connected tosaid body,f.

the apex of said fire pot intersecting and extending substantiallyentirely across the longitudinal plane of the discharge end of the blastpipe.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

CHARLES E. PINNEY, P. J. I-IINoKs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

